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_archive/rhai_engine/rhaibook/rust/context-restore.md

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+Advanced Usage – Restore `NativeCallContext`
+==================================================
+
+{{#include ../links.md}}
+
+
+The [`NativeCallContext`] type encapsulates the entire _context_ of a script up to the
+particular point of the native Rust function call.
+
+The data inside a [`NativeCallContext`] can be stored (as a type `NativeCallContextStore`) for later
+use, when a new [`NativeCallContext`] can be constructed based on these stored data.
+
+A reconstructed [`NativeCallContext`] acts almost the same as the original instance, so it is possible
+to suspend the evaluation of a script, and to continue at a later time with a new
+[`NativeCallContext`].
+
+Doing so requires the [`internals`] feature to access internal APIs.
+
+### Step 1: Store `NativeCallContext` data
+
+```rust
+// Store context for later use
+let context_data = context.store_data();
+
+// ... store 'context_data' somewhere ...
+secret_database.push(context_data);
+```
+
+### Step 2: Restore `NativeCallContext`
+
+```rust
+// ... do something else ...
+
+// Restore the context
+let context_data = secret_database.get();
+
+let new_context = context_data.create_context(&engine);
+```